in reply to Re^4: Organizing and presenting a cross-reference
in thread Organizing and presenting a cross-reference

I assure you that this is not the way it works;

Sorry, but this is a subject I know a little about so you'll excuse me if I don't take your word for this. Just because your local autoparts shop has made some attempt at deriving a table of cross-manufacturer equivalences, doesn't mean that they knew what they were doing when the did so. Having been burned (expensively) with just such a "Yeah! That'll do the job" assurance...I'm twice shy!

plugs with different operating parameters get a different part number.

Yes, within any given manufacturers range. But, as the presence of two or more 'equivalent' parts within a single manufacturers range testifies, the ranges can overlap. So, for example, you might have: 

Cylinder Temp: low----A--B-------C-------D-----------high
ManA
  plug1        ********** 
  plug2             **************
ManB
  plug1          *********************
  plug2                   *********************

[download]

For a vehicle requiring C, ManA.plug2 and ManB.plug2 are interchangable.

But using that equivalence to suggest fitting ManA.plug2s to a vehicle D, specified as taking ManB.plug2 could be costly.

This is why all the manufacturers ask for the application in order to recommend the plugs in their range.

You might want to read this, paying particular attention to the last paragraphs on pages 2 and 3.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
"Too many [] have been sedated by an oppressive environment of political correctness and risk aversion."

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Re^6: Organizing and presenting a cross-reference
by oko1 (Deacon) on Sep 24, 2008 at 15:10 UTC

    [sigh] And this would be the other reason for my not wanting to present this specific data set. I really did not want to get into an argument about the merits of spark plugs, etc. - I just want to know how to organize the data in the way that I stated. I'd appreciate it if you could help me do that; if a bad experience with your local car shop means that you can't do that, well, thanks for your effort so far.


    --
    "Language shapes the way we think, and determines what we can think about."
    -- B. L. Whorf
[reply]

      Your missing the point BrowserUk is making.

      What you have been told by your autoshop is not correct, it may well do for the parts salesman but it is not the correct way to identify the right plug for the job.

      Plugs vary as BrowserUk has said across a spectrum of temperature ranges and individual models of the same car may require different plugs depending on the conditions they are operating in.

      Different manufactures plugs within the same temperature range do not always have the same equivalent across the range. So a NGK plug may have a choice of two plugs in say the Autolite range or vica versa. It all depends on what the plug is fitted to and the conditions it will be used in.

      So you need the fitting details ie Car or boat model year engine size sometimes even a chasis/engine number etc.

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